Ta Xupeng, Zhang Yuan, Wan Zhijun, Shi Peng, Zhou Jiale
School of Mines, China University of Mining & Technology, Xuzhou 221116, China.
Department of New Energy Science & Engineering, China University of Mining & Technology, Xuzhou 221116, China.
Materials (Basel). 2023 Mar 29;16(7):2725. doi: 10.3390/ma16072725.
Environmental problems caused by large amounts of CO generated by coal-electricity integration bases have raised concerns. To solve these problems, this study develops a CO foam concrete (CFC) material with both heat insulation and carbon fixation characteristics to realize CO in situ storage and utilization. In this study, a Portland-cement-based CO foam concrete (PC-CFC) with good thermal insulation performance and carbon fixation ability is prepared using carbonation pretreatment cement and a physical foaming method. The effects of CO on the compressive strength, thermal insulation, and carbon fixation properties of PC-CFC are studied. The internal relationship between the compressive strength, thermal insulation, and carbon fixation performance of PC-CFC is analyzed, and the feasibility of PC-CFC as a filling material to realize the in situ mineralization and storage of CO in the coal-electricity integration base is discussed. The experimental results show that the compressive strength of PC-CFC is significantly improved by CO curing. However, CO in the PC-CFC pores may weaken the strength of the pore structure, and the compressive strength decreases by 3.62% for each 1% increase in PC-CFC porosity. Using CO as a foaming gas and the physical foaming method to prepare CFC can achieve improved thermal insulation performance. The thermal conductivity of PC-CFC is 0.0512-0.0905 W/(m·K). In addition, the compressive strength of PC-CFC increases by 19.08% when the thermal conductivity of PC-CFC increases by 1%. On the premise of meeting the thermal insulation requirements, PC-CFC can achieve improved compressive strength. The carbon sequestration rate of the PC-CFC skeleton is 6.1-8.57%, and the carbon storage capacity of PC-CFC pores is 1.36-2.60 kg/ton, which has obvious carbon sequestration potential; however, the preparation process and parameters of PC-CFC still require further improvement. The research results show that PC-CFC has great potential for engineering applications and is of great significance for realizing carbon reduction at the coal-electricity integration base.
煤电一体化基地产生大量一氧化碳所引发的环境问题已引起关注。为解决这些问题，本研究开发了一种兼具保温和固碳特性的一氧化碳泡沫混凝土（CFC）材料，以实现一氧化碳的原位储存与利用。本研究采用碳化预处理水泥和物理发泡法制备了具有良好保温性能和固碳能力的波特兰水泥基一氧化碳泡沫混凝土（PC-CFC）。研究了一氧化碳对PC-CFC抗压强度、保温性能和固碳性能的影响。分析了PC-CFC抗压强度、保温性能和固碳性能之间的内在关系，并探讨了PC-CFC作为填充材料在煤电一体化基地实现一氧化碳原位矿化和储存的可行性。实验结果表明，一氧化碳养护显著提高了PC-CFC的抗压强度。然而，PC-CFC孔隙中的一氧化碳可能会削弱孔隙结构的强度，PC-CFC孔隙率每增加1%，抗压强度下降3.62%。以一氧化碳作为发泡气体并采用物理发泡法制备CFC可实现保温性能的提升。PC-CFC的导热系数为0.0512 - 0.0905W/(m·K)。此外，PC-CFC的导热系数每增加1%，其抗压强度增加19.08%。在满足保温要求的前提下，PC-CFC可实现抗压强度的提升。PC-CFC骨架的固碳率为6.1 - 8.57%，PC-CFC孔隙的碳储存量为1.36 - 2.60kg/吨，具有明显的固碳潜力；然而，PC-CFC的制备工艺和参数仍需进一步改进。研究结果表明，PC-CFC具有巨大的工程应用潜力，对实现煤电一体化基地的碳减排具有重要意义。
